PLATE XXIII 



Vaccinium scoparium (43a, 43b, and 43c*) 



(Same synopsis as for Vaccinium membranaceum , page 50) 



Rhus glabra (44a and 44b) 



Vessels present; vessels solitary, in pairs, or in various ag- 

 gregates; vessels grade into smaller sizes as the growing 

 season progresses without an abrupt change in size; vessels 

 solitary or in clusters of a few cells in the early wood pro- 

 gressing to radial files which are grouped secondarily to form 

 tangential bands in the late wood; perforation plate simple; 

 axial parenchyma distributed as two to several cells on the 

 periphery of each vessel group; rays one or two cells wide 

 (rarely three). 



